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Positive clinical trial

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• Positive pressure ventilation

  The provision of air under pressure by a mechanical respirator, a machine designed to improve the exchange of air between the lungs and the atmosphere. The device is basically designed for administering artificial respiration, especially for a prolonged period, in the event of inadequate spontaneous ventilation or respiratory paralysis. The mechanical ventilator was invented in […]

• Positive, false

  A result that indicates that a given condition is present when it is not. An example of a false positive would be if a particular test designed to detect cancer returns a positive result but the person does not have ‘cancer.

• Positron emission tomography

  Unlike CT or MRI, which look at anatomy or body form, PET studies metabolic activity or body function. As a result, PET can detect tumors in lymph nodes, for example, even before they enlarge and are detectable with MRI or CT. In PET imaging, the patient receives a small intravenous injection of a radio-active medication […]

• Post

  Short for postmortem examination (an autopsy).

• Post-exposure prophylaxis

  A treatment administered following exposure to a harmful agent which attempts to block or reduce injury or infection. Prophylaxis means a defense or protection. Post-exposure prophylaxis (PEP), for example, might concern the treatment of a health care worker exposed by a needle stick to HIV with a drug such as AZT to protect them from […]

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